Final answer:
Whitelisting area codes for Local Presence Dialing allows businesses to display local numbers when calling, which can increase the likelihood of calls being answered, thereby improving the effectiveness of sales and outreach efforts.
Step-by-step explanation:
The significance of whitelisting area codes for Local Presence Dialing within Dialer settings is that it allows calls to be made only from specific area codes. This feature is essential for businesses that want to increase the likelihood of their calls being answered by presenting a local number to the call recipients. When a local area code is displayed, recipients are more likely to trust the caller and are thus more inclined to answer the call. This strategy does not directly improve call quality or reduce call costs, but it can potentially improve the effectiveness of the sales or outreach efforts by increasing answer rates.